diff --git a/core/server/utils/index.js b/core/server/utils/index.js
index 2e17b60d40..72167f1327 100644
--- a/core/server/utils/index.js
+++ b/core/server/utils/index.js
@@ -48,7 +48,7 @@ utils = {
             charlen = chars.length,
             i;
 
-        for (i = 1; i < len; i = i + 1) {
+        for (i = 0; i < len; i = i + 1) {
             buf.push(chars[getRandomInt(0, charlen - 1)]);
         }